974 



MAMMILLARIA 



MAMMILLARIA 



7 cornifera, DC. Tubercles ovate, thick, rather 

 crowded: radial spines 15-17, ashy white, (3 lines long; 

 central 1, longer and stouter, erect, somewhat curved. 

 Mexico. 



8. daimonoceras, Lem. Vertex impressed, very woully : 

 tubercles erect-conical: spines grayish; radiais 20 or 

 more, the upper accessory ones fascicled; centrals usu- 

 ally 3, stronger, the 2 upper divaricate and somewhat 

 recurved, the lower horizontal or recurved. Mexico. 



9. Echinus, Engelra. Differs from the above in the 

 less depressed shape and rather more numerous spines. 

 Southern Tex. to Mex. 



10. scolymoldes, Scheidw. At length somewhat ces- 

 pitose: tubercles conical, bent inwards and imbricated: 

 radial spines 14-20, whitish or horn-colored; centrals 

 1-4, longer and darker, the upper mingled with the up- 

 per radiais, the lower stouter and bent downwards: fls. 

 2 in. in, diam. Mex., south of the Rio Grande. 



11. r&.dians, DC. Stems simple: axils naked: tubercles 

 oval, large: spines white, rigid, subtomentose. Mex. 



12. pectinata, Engelm. Stem simple: tubercles quad- 

 rangular at base, conical above; areolae round-oblong: 

 spines lG-24, yellowish, laterally compressed at base, 

 stiff, pectinate, somewhat recurved: Us. 2% in. in diam. ; 

 petals broadest above, obtusish. Pecos river and Leon 

 Springs, Tex. 



1.3. impexicoma, Lem. Vertex deeply impressed, 

 densely woolly : tubercles somewhat angulate; areolae 

 round: spines 18-20, gray, rigid, covering the whole 

 plant; very rarely a single porrect central. Mex. 



14. sulcELta, Engelm. {M. caleardta, Engelm.). 

 Densely cespitose from tlie upper part of the grnove: 

 tubercles 7-B lines long, ovate-oblong, with dilated 

 base, somewhat imbricate, spreading in age: spines 

 gray, rigid, subulate; radiais 12-15, the upper 3-5, fas- 

 cicled; central 1, recurved, wanting in younger plants: 

 t\s.2}4 in. ill expansion, the tube red within; sepals not 

 fringed. Tex., from the Brazos to the Nueces river. 



15. Nickelsae, Brandg. {3f. Nlckelsii, Hort. ). Very 

 near the preceding, but radial spines more numerous, 

 14-18, the fascicled upper ones much longer than the 

 lower, and no central. Mex., south of Laredo, Tex. 



16. Mlssouri6nsi3, Sweet [M. Nutiallii, Engelm.). 

 Nearly simple, 1-2 in. in diam.: tubercles cylindric- 

 conical, loose and spreading, slightly grooved: spines 

 white, weak, puberulent, not hiding the body; radiais 

 12-17, spreading; central one longer and stouter, often 

 wanting; fls. about 1 in. long, yellow to fawn-color, with 

 reddish streak; sepals fimbriate; petals acute or acu- 

 minate: berry red, the shape and size of a small pea; 

 seeds black and pitted. Mont, to Kans. and E. Colo. 



Var, similis, Engelm. Cespitose, in clumps often a 

 foot broad: spines fewer: fl. and fr. larger. Kansas 

 river to Texas. 



Var. robustior, Engelm. {M. Wis.'^man^ili, Hildm.). 

 Almost simple: tubercles longer and looser; spines 

 smooth, rather short and stout; radiais 10-12; central 

 1: Us. even larger than in M. similii;. Tex. 



17. macrom^ris, Engelm. Fig. 1355. Low, usually 

 soon proliferous, dark .ii;reen: tubercles large and long, 

 loose and spreading, but often incurved; groove rather 

 short; radiais 10-17, weak, slender and spreading; cen- 

 trals at maturity usually 4, somewhat stouter and much 

 longer, sometimes more than 2 in. long: fls. purple, 

 often 3 in. in expansion; petals erose, mucronate: fr. 

 with several scales on the ovary. Along the Rio Grande 

 from New Mexico to Texas. See, also. Fig. 74(Ja. 



18. conoidea, DC. (M. strohiliformls, Engelm.). 

 Ovate-conical, with densely woolly vertex : tubercles 

 short, usually densely appressed-imbricate in 8-10 

 spiral, rib-like rows: radial spines 10-16, straight and 

 stout; centrals .3-5, stouter, blackish, the upper ones 

 erect-spreading, the lower stouter, horizontal or de- 

 flexed: fls. about 1 in. in expansion, deep purple, paler 

 outside: fr. short, buried and hidden in the axillary 

 wool. N. E. Mex. 



19. vivipara, Haw. Pig. 1356. Low and depressed 

 globose, usually cespitose, forming large masses: tu 

 bercles terete and loose: radial spines 12-20, slender but 



stiff; centrals usually 4, but sometimes as many as 8, 

 brownish, the upper erect-spreading, the lower stouter 

 and deflexed: fls. bright purple, 1-lK in. in expansion; 

 stigmas mucronate. Prom southern Br. Am., through 

 the upper Missouri region to E. Colo. 



20. radidsa, Engelm. Ovate or cylindrical, sometimes 

 proliferous: tubercles terete: radial spines 20-30, white 

 with dusky apex, very unequal; centrals 4 or 5, stouter 

 and longer, tawny, upper ones longer, lowest shorter 

 and horizontal: fls. \%~2 in. in expansion; stigmas ob- 

 tuse. Southern Tex. and northern Mex. 



Var. Neo-Mezicana, Engelm. [M. Rirschtidna, Haage. 

 Jun.). Lower, more or less proliferous from the lower 

 grooves : radial spines 20-40, white ; centrals 3-12, 

 white below, blackish above. 



Var. bore^lis, Engelm. Ovate or subglobose : radial 

 spines 12-20; centrals 3-6, purple-spotted. Very near 

 M. vivipara. 



Var. Ariz6niea, Engelm. Globose or ovate, large: tu- 

 bercles long-cylindrical: ra<Ual spines 15-20, whitish; 

 centrals 3-6, deep brown aljove: fls. large, rose-colored. 

 N. Arizona. 



Var. des6rti, Engelm. Low, simple, with slender 

 nearly cylindric tubercles: radial spines 15-20; centrals 

 8-10, reddish tipped : fls. straw-colored, with purplish 

 tips. Ivanpah, Calif. 



Var. chlorAntha, Engelm. Cylindrical, sometimes as 

 much as 9 in. high : radial spines 20-25, almost in 2 

 series, gray; centrals 6-9, stouter, K-1 in. long, reddish 

 only at tip: fls. greenish yellow. S. Utah. 



Var, Alversoni, Coulter. "Foxtail Cactus." Robust 

 and branching, sometimes 10 in. long, glaucous: tuber- 

 cles short and broad, somewhat angled, forming more 

 or less distinct ribs: radial spines numerous; centrals 

 8-14, stout, spreading, blackish half-way down : fls. 

 pink. S. E. Calif. 



21. dasyacAntha, Engelm. Simple, subglobose : tu- 

 bercles terete, loose : radial spines 25-35, bair-like, 

 white, with brownish apex; centrals 7-13, bristle-like, 

 pale below, brown above, longer, the most interior one 

 horizontal, sometimes wanting: seeds black, with nearly 

 basal hilum. Tex. 



1355. Mammillaria macromeris (X Yi) ■ No. 17. 



22. tuberculdsa, Engelm. (iW. s^/■o/>(7iMrm?.'?, Scheer). 

 Ovate or cylindric, rather slender, somewhat dry of tex- 

 ture, the spines falling from the older tubercles, leaving 

 tliem as dry, corky protuberances: tubercles short-ovate 

 from a broad base; axils densely woolly: radial spines 

 20-30, slender, rigid, white; centrals 5^9, stouter, pur- 



